AuroraMiddleware/v8
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Tracks the maximum usage of executable memory allocated by V8 and allows the histogram data to be gathered and reported.

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This patch is contains only the usage tracking logic from 3030048 (already LGTM'd). It does not implement the RWX Limit. 

BUG=52122
TEST=Check the V8.ExecutableMemoryMax histogram in the Chrome about:histograms page

Review URL: http://codereview.chromium.org/3161015


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5299 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
sgjesse@chromium.org 2010-08-18 10:45:15 +00:00
parent 85718e89ac
commit 3005fe4a1d
3 changed files with 74 additions and 21 deletions
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26
src/spaces-inl.h
View File

@ -220,21 +220,22 @@ void Page::ClearRegionMarks(Address start, Address end, bool reaches_limit) {
void Page::FlipMeaningOfInvalidatedWatermarkFlag() {
watermark_invalidated_mark_ ^= WATERMARK_INVALIDATED;
watermark_invalidated_mark_ ^= 1 << WATERMARK_INVALIDATED;
}
bool Page::IsWatermarkValid() {
return (flags_ & WATERMARK_INVALIDATED) != watermark_invalidated_mark_;
return (flags_ & (1 << WATERMARK_INVALIDATED)) != watermark_invalidated_mark_;
}
void Page::InvalidateWatermark(bool value) {
if (value) {
flags_ = (flags_ & ~WATERMARK_INVALIDATED) | watermark_invalidated_mark_;
flags_ = (flags_ & ~(1 << WATERMARK_INVALIDATED)) |
watermark_invalidated_mark_;
} else {
flags_ = (flags_ & ~WATERMARK_INVALIDATED) |
(watermark_invalidated_mark_ ^ WATERMARK_INVALIDATED);
flags_ = (flags_ & ~(1 << WATERMARK_INVALIDATED)) |
(watermark_invalidated_mark_ ^ (1 << WATERMARK_INVALIDATED));
}
ASSERT(IsWatermarkValid() == !value);
@ -242,15 +243,15 @@ void Page::InvalidateWatermark(bool value) {
bool Page::GetPageFlag(PageFlag flag) {
return (flags_ & flag) != 0;
return (flags_ & (1 << flag)) != 0;
}
void Page::SetPageFlag(PageFlag flag, bool value) {
if (value) {
flags_ |= flag;
flags_ |= (1 << flag);
} else {
flags_ &= ~flag;
flags_ &= ~(1 << flag);
}
}
@ -289,6 +290,15 @@ void Page::SetIsLargeObjectPage(bool is_large_object_page) {
SetPageFlag(IS_NORMAL_PAGE, !is_large_object_page);
}
bool Page::IsPageExecutable() {
return GetPageFlag(IS_EXECUTABLE);
}
void Page::SetIsPageExecutable(bool is_page_executable) {
SetPageFlag(IS_EXECUTABLE, is_page_executable);
}
// -----------------------------------------------------------------------------
// MemoryAllocator

43
src/spaces.cc
View File

@ -41,7 +41,7 @@ namespace internal {
&& (info).top <= (space).high() \
&& (info).limit == (space).high())
intptr_t Page::watermark_invalidated_mark_ = Page::WATERMARK_INVALIDATED;
intptr_t Page::watermark_invalidated_mark_ = 1 << Page::WATERMARK_INVALIDATED;
// ----------------------------------------------------------------------------
// HeapObjectIterator
@ -266,6 +266,7 @@ void CodeRange::TearDown() {
//
int MemoryAllocator::capacity_ = 0;
int MemoryAllocator::size_ = 0;
int MemoryAllocator::size_executable_ = 0;
VirtualMemory* MemoryAllocator::initial_chunk_ = NULL;
@ -292,6 +293,8 @@ int MemoryAllocator::Pop() {
}
void *executable_memory_histogram = NULL;
bool MemoryAllocator::Setup(int capacity) {
capacity_ = RoundUp(capacity, Page::kPageSize);
@ -308,6 +311,9 @@ bool MemoryAllocator::Setup(int capacity) {
if (max_nof_chunks_ > kMaxNofChunks) return false;
size_ = 0;
size_executable_ = 0;
executable_memory_histogram =
StatsTable::CreateHistogram("V8.ExecutableMemoryMax", 0, MB * 512, 50);
ChunkInfo info; // uninitialized element.
for (int i = max_nof_chunks_ - 1; i >= 0; i--) {
chunks_.Add(info);
@ -353,6 +359,16 @@ void* MemoryAllocator::AllocateRawMemory(const size_t requested,
}
int alloced = static_cast<int>(*allocated);
size_ += alloced;
if (executable == EXECUTABLE) {
size_executable_ += alloced;
static int size_executable_max_observed_ = 0;
if (size_executable_max_observed_ < size_executable_) {
size_executable_max_observed_ = size_executable_;
StatsTable::AddHistogramSample(executable_memory_histogram,
size_executable_);
}
}
#ifdef DEBUG
ZapBlock(reinterpret_cast<Address>(mem), alloced);
#endif
@ -361,7 +377,9 @@ void* MemoryAllocator::AllocateRawMemory(const size_t requested,
}
void MemoryAllocator::FreeRawMemory(void* mem, size_t length) {
void MemoryAllocator::FreeRawMemory(void* mem,
size_t length,
Executability executable) {
#ifdef DEBUG
ZapBlock(reinterpret_cast<Address>(mem), length);
#endif
@ -372,6 +390,7 @@ void MemoryAllocator::FreeRawMemory(void* mem, size_t length) {
}
Counters::memory_allocated.Decrement(static_cast<int>(length));
size_ -= static_cast<int>(length);
if (executable == EXECUTABLE) size_executable_ -= length;
ASSERT(size_ >= 0);
}
@ -425,7 +444,7 @@ Page* MemoryAllocator::AllocatePages(int requested_pages, int* allocated_pages,
*allocated_pages = PagesInChunk(static_cast<Address>(chunk), chunk_size);
if (*allocated_pages == 0) {
FreeRawMemory(chunk, chunk_size);
FreeRawMemory(chunk, chunk_size, owner->executable());
LOG(DeleteEvent("PagedChunk", chunk));
return Page::FromAddress(NULL);
}
@ -591,7 +610,7 @@ void MemoryAllocator::DeleteChunk(int chunk_id) {
Counters::memory_allocated.Decrement(static_cast<int>(c.size()));
} else {
LOG(DeleteEvent("PagedChunk", c.address()));
FreeRawMemory(c.address(), c.size());
FreeRawMemory(c.address(), c.size(), c.owner()->executable());
}
c.init(NULL, 0, NULL);
Push(chunk_id);
@ -2552,7 +2571,7 @@ LargeObjectChunk* LargeObjectChunk::New(int size_in_bytes,
if (mem == NULL) return NULL;
LOG(NewEvent("LargeObjectChunk", mem, *chunk_size));
if (*chunk_size < requested) {
MemoryAllocator::FreeRawMemory(mem, *chunk_size);
MemoryAllocator::FreeRawMemory(mem, *chunk_size, executable);
LOG(DeleteEvent("LargeObjectChunk", mem));
return NULL;
}
@ -2590,7 +2609,12 @@ void LargeObjectSpace::TearDown() {
LargeObjectChunk* chunk = first_chunk_;
first_chunk_ = first_chunk_->next();
LOG(DeleteEvent("LargeObjectChunk", chunk->address()));
MemoryAllocator::FreeRawMemory(chunk->address(), chunk->size());
Page* page = Page::FromAddress(RoundUp(chunk->address(), Page::kPageSize));
Executability executable =
page->IsPageExecutable() ? EXECUTABLE : NOT_EXECUTABLE;
MemoryAllocator::FreeRawMemory(chunk->address(),
chunk->size(),
executable);
}
size_ = 0;
@ -2654,6 +2678,7 @@ Object* LargeObjectSpace::AllocateRawInternal(int requested_size,
// low order bit should already be clear.
ASSERT((chunk_size & 0x1) == 0);
page->SetIsLargeObjectPage(true);
page->SetIsPageExecutable(executable);
page->SetRegionMarks(Page::kAllRegionsCleanMarks);
return HeapObject::FromAddress(object_address);
}
@ -2768,6 +2793,10 @@ void LargeObjectSpace::FreeUnmarkedObjects() {
previous = current;
current = current->next();
} else {
Page* page = Page::FromAddress(RoundUp(current->address(),
Page::kPageSize));
Executability executable =
page->IsPageExecutable() ? EXECUTABLE : NOT_EXECUTABLE;
Address chunk_address = current->address();
size_t chunk_size = current->size();
@ -2783,7 +2812,7 @@ void LargeObjectSpace::FreeUnmarkedObjects() {
MarkCompactCollector::ReportDeleteIfNeeded(object);
size_ -= static_cast<int>(chunk_size);
page_count_--;
MemoryAllocator::FreeRawMemory(chunk_address, chunk_size);
MemoryAllocator::FreeRawMemory(chunk_address, chunk_size, executable);
LOG(DeleteEvent("LargeObjectChunk", chunk_address));
}
}

26
src/spaces.h
View File

@ -197,6 +197,10 @@ class Page {
inline void SetIsLargeObjectPage(bool is_large_object_page);
inline bool IsPageExecutable();
inline void SetIsPageExecutable(bool is_page_executable);
// Returns the offset of a given address to this page.
INLINE(int Offset(Address a)) {
int offset = static_cast<int>(a - address());
@ -256,13 +260,16 @@ class Page {
STATIC_CHECK(kRegionSize == kPageSize / kBitsPerInt);
enum PageFlag {
IS_NORMAL_PAGE = 1 << 0,
WAS_IN_USE_BEFORE_MC = 1 << 1,
IS_NORMAL_PAGE = 0,
WAS_IN_USE_BEFORE_MC,
// Page allocation watermark was bumped by preallocation during scavenge.
// Correct watermark can be retrieved by CachedAllocationWatermark() method
WATERMARK_INVALIDATED = 1 << 2
WATERMARK_INVALIDATED,
IS_EXECUTABLE,
NUM_PAGE_FLAGS // Must be last
};
static const int kPageFlagMask = (1 << NUM_PAGE_FLAGS) - 1;
// To avoid an additional WATERMARK_INVALIDATED flag clearing pass during
// scavenge we just invalidate the watermark on each old space page after
@ -291,7 +298,7 @@ class Page {
inline void ClearGCFields();
static const int kAllocationWatermarkOffsetShift = 3;
static const int kAllocationWatermarkOffsetShift = WATERMARK_INVALIDATED + 1;
static const int kAllocationWatermarkOffsetBits = kPageSizeBits + 1;
static const uint32_t kAllocationWatermarkOffsetMask =
((1 << kAllocationWatermarkOffsetBits) - 1) <<
@ -557,7 +564,9 @@ class MemoryAllocator : public AllStatic {
static void* AllocateRawMemory(const size_t requested,
size_t* allocated,
Executability executable);
static void FreeRawMemory(void* buf, size_t length);
static void FreeRawMemory(void* buf,
size_t length,
Executability executable);
// Returns the maximum available bytes of heaps.
static int Available() { return capacity_ < size_ ? 0 : capacity_ - size_; }
@ -565,6 +574,9 @@ class MemoryAllocator : public AllStatic {
// Returns allocated spaces in bytes.
static int Size() { return size_; }
// Returns allocated executable spaces in bytes.
static int SizeExecutable() { return size_executable_; }
// Returns maximum available bytes that the old space can have.
static int MaxAvailable() {
return (Available() / Page::kPageSize) * Page::kObjectAreaSize;
@ -628,6 +640,8 @@ class MemoryAllocator : public AllStatic {
// Allocated space size in bytes.
static int size_;
// Allocated executable space size in bytes.
static int size_executable_;
// The initial chunk of virtual memory.
static VirtualMemory* initial_chunk_;
@ -2058,7 +2072,7 @@ class LargeObjectChunk {
LargeObjectChunk* next() { return next_; }
void set_next(LargeObjectChunk* chunk) { next_ = chunk; }
size_t size() { return size_; }
size_t size() { return size_ & ~Page::kPageFlagMask; }
void set_size(size_t size_in_bytes) { size_ = size_in_bytes; }
// Returns the object in this chunk.